acpi: Unconditional GED build
cover acpi: Unconditional GED build
The Generic Event Device is a hardware-reduced ACPI specific device, but kernels supporting both fixed and hardware-reduced ACPI hardware should be able to probe it dynamically.
For that purpose, here are 2 patches:
- The first one makes the GED device probe fail on non hardware-reduced platforms.
- The second one disable the conditional evged build.
Arjan van de Ven (1):
acpi: Always build evged in
Samuel Ortiz (1):
acpi: Fail GED probe when not on hardware-reduced
drivers/acpi/Makefile | 2 +- drivers/acpi/evged.c | 3 +++ 2 files changed, 4 insertions(+), 1 deletion(-)
Signature · 1 line
2.21.0
PATCH 1/2 acpi: Fail GED probe when not on hardware-reduced
The Generic Event Device (GED) is a hardware-reduced platform device. Probing this driver on fixed platforms should fail.
--- drivers/acpi/evged.c | 3 +++ 1 file changed, 3 insertions(+)
drivers/acpi/evged.c +3 -0
@@ -127,6 +127,9 @@ static int ged_probe(struct platform_device *pdev)struct acpi_ged_device *geddev;acpi_status acpi_ret; +if (!acpi_gbl_reduced_hardware) +return -ENODEV ; + geddev =devm_kzalloc (&pdev->dev,sizeof (*geddev),GFP_KERNEL );if (!geddev)return -ENOMEM ;
Signature · 1 line
2.21.0
Rafael J. Wysocki
maintainerRe: [PATCH 1/2] acpi: Fail GED probe when not on hardware-reduced
Quoted 2 lines · Samuel Ortiz
The Generic Event Device (GED) is a hardware-reduced platform device.
No, it is not AFAICS.
The spec doesn't say that GED cannot be used on platforms that aren't HW-reduced and if evged.c is going to be built in unconditionally, the kernel will be able to handle GED regardless.
Quoted 24 lines
Probing this driver on fixed platforms should fail.
Signed-off-by Samuel Ortiz <[email protected]>--- drivers/acpi/evged.c | 3 +++ 1 file changed, 3 insertions(+)drivers/acpi/evged.c +3
-1@@ -127,6 +127,9 @@ static int ged_probe(struct platform_device *pdev)struct acpi_ged_device *geddev;acpi_status acpi_ret; +if (!acpi_gbl_reduced_hardware) +return -ENODEV ; + geddev =devm_kzalloc (&pdev->dev,sizeof (*geddev),GFP_KERNEL );if (!geddev)return -ENOMEM ; --2.21.0
Re: [PATCH 1/2] acpi: Fail GED probe when not on hardware-reduced
Quoted 5 lines · Rafael J. Wysocki
Quoted 2 lines · Samuel Ortiz
The Generic Event Device (GED) is a hardware-reduced platform device.
No, it is not AFAICS.
It's a little confusing, I was not sure what's the common understanding and tried to be safe by not having non HW-reduced machines getting a new device that they've never seen so far.
Quoted 2 lines
The spec doesn't say that GED cannot be used on platforms that aren't HW-reduced
I agree.
Quoted 2 lines
and if
evged.cis going to be built in unconditionally, the
kernel will be able to handle GED regardless.
Ok, perfect then. Does that mean you're ok with the 2nd patch but are going to drop this one?
Cheers,
Samuel.
Rafael J. Wysocki
maintainerRe: [PATCH 1/2] acpi: Fail GED probe when not on hardware-reduced
Quoted 10 lines · Samuel Ortiz
Quoted 5 lines · Rafael J. Wysocki
Quoted 2 lines · Samuel Ortiz
The Generic Event Device (GED) is a hardware-reduced platform device.
No, it is not AFAICS.
It's a little confusing, I was not sure what's the common understanding and tried to be safe by not having non HW-reduced machines getting a new device that they've never seen so far.
I really don't expect firmware to expose GED for such machines (why would it?), but if it does so, then why not to handle it?
Quoted 8 lines
Quoted 2 lines
The spec doesn't say that GED cannot be used on platforms that aren't HW-reduced
I agree.
Quoted 2 lines
and if
evged.cis going to be built in unconditionally, the
kernel will be able to handle GED regardless.Ok, perfect then. Does that mean you're ok with the 2nd patch but are going to drop this one?
Sure, I will apply the second patch only.
Thanks!
PATCH 2/2 acpi: Always build evged in
In reply to Samuel OrtizFrom: Arjan van de Ven <[email protected]>
Although the Generic Event Device is a Hardware-reduced platfom device, it should not be restricted to ACPI_REDUCED_HARDWARE_ONLY. Kernels supporting both fixed and hardware-reduced ACPI platforms should be able to probe the GED when dynamically detecting that a platform is hardware-reduced. For that, the driver must be unconditionally built in.
--- drivers/acpi/Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
drivers/acpi/Makefile +1 -1
@@ -48,7 +48,7 @@ acpi-y += acpi_pnp.o acpi-$(CONFIG_ARM_AMBA) += acpi_amba.o acpi-y += power.o acpi-y += event.o -acpi-$(CONFIG_ACPI_REDUCED_HARDWARE_ONLY) += evged.o +acpi-y += evged.o acpi-y += sysfs.o acpi-y += property.o acpi-$(CONFIG_X86) += acpi_cmos_rtc.o
Signature · 1 line
2.21.0